Air-pump.



entran srarns rarnnrorumn rnrrz n. "HOIIENSTIEN AND CHARLES e. Mesures,or RICHMOND, INDIANA.kv

T 0 'al l whom i may concern Be it knownthat, we, FRITZ K. HoHnN- thecounty of l-Vayne and State ot' Indiana,

I have invented certain new and useful Improvision of an air pump whichmay be quickly and easily *attached to or detached from the cylinder ofan engine.

c A still further Vobject of this invention is the provision of an 'airpump comprising a cylinder having a piston mounted tor reciprocationtherein, the cylinder being adapted for connection with the spark plugopening ot the engine cylinder, the movement of the pist-on of thelpumpbein'g dependent upon vthe recigrocation of the piston of theengine.

`With these and other objects in view, our invention resides in thenovel construction and arrangement offparts to be hereinafter more fullydescribed, claimed and illustrated in the accompanying drawing, inwhich, I 1rFigurel 1 is a longitudinal section of the i pump showing itapplied to the cylinder of an enfrine. Fie: 2 1s a tra mentar section l;of the piston connection. .'Fig. 3 is a section taken on the line 3-8 ofFig. 4. Fig. 4 is l.a fragmentary .elevat-ion of the piston connection.

Referring moreparticularly to the drawing, the numeral*1designates thecylinder otua motorcycle engine, the cylinder being ot any. desiredconstruction inl which is mounted a lpiston 2, Athe cylinder having theusual spark plug opening 3, 1n which Is insert-ed one end oit'V an elbow4. The air pump,

'comprises a cylinder-'5 which is formed at one end with a neck '6, theneck being adaptjed to enter the opposite end of the elbow 4,

vand being formedy with an opening 7 in one side tor the reception of aspark plug which either end of it-s stroke.

Speccation of Letters Patent. Patented Sept, 1913,y 'y applicati@ meaDeeember 11, 1912. serial No. 736,187.

may he of any suitable construction. The opposite end-0f the cylinder 5is exteriorly threaded as at 9 for the rece tion of an interiorlythreaded flange 10 o one end. of

another cylinder 11. A piston 12 is Amount-v ed for reciprocation in thecylinder 5 and.

suitable piston rings 13 are mounted on the periphery of the piston toform a tight joint between the cylinder` and the piston. A similarpiston 14, having piston rings 15, is

mounted for reciprocation in the cylinder 1l and connect-ing the pistons12 and 14 is a suitable piston rod 16. Suitable buler springs 17 aremounted upon the head 18'of the cylinder 5 and the head 19 of thecylinder 11 to form cushions for the .piston 12'at The outer end of thecylinder 11 is exteriorly threaded as at 20 for the recept-ion of thethreads 21 of the cylinder cap 22, which is provided with suitableopenings 23 for the ingress and outlet of air. Suitable openings 24 and25 respectively are formed in the outer head of the cylinder 11, and aninwardly opening check valve l26 is disposed lin the opening 24Aandpsecured in thev outlet opening 25 is one end oflan air hose 27 inwhich is mounted a ball valve 28 which is'adapted to normally close theopening 25.

. It will be understood that our invention is adapted to be secured inthe spark plug opening of an engine of the four cycletype and upon thedownward or aspirating stroke of the enginepiston 2, the pistons 12 and14 will be drawn toward the inner ends of the cylinders 5 and 11respectively by reason ofl the suction in the cylinders caused bytheinovement of'the piston 2, and air will be drawn into the cylinder 11through the inlet opening 24 of the cylinder. Upon the upper orcompression stroke of thev piston of 'the engine, the pistons 12 and 14are moved outwardly whereupon the supply of air in the piston 1 1 isforced out through the outlet opening 25 into the air hose 27 and thenceinto the tire (not shown). Upon the secondi downward or explosive strokeof the piston 2, the piston 12 acts as a reactionary me1nber, andremains stationary against the inner head 19 of the cylinder 11, whilethe pistony v2 is moved downwardly byreason of the torceA oftheexplosion. Upon the fourth cycle of the engine, the piston 2 is movedupwardly 'whereupon the burned gases arev forced out of the Cylinder,and then the operation'of the. pump is repeated.

.It is apparent that upon the fourth cycle for exhaust stroke of thepiston 2, a portion of the burned gases` will be forced into thecylinder of the pump, and to allow the burned gases to escape from thecylinder through the outlet ports 29 in the head 19 v of the cylinder11, we have provided a ilexible connection between the lpistons 12 andcured to the piston 111, extends tor a short distance vinto the outerend of the hollow piston rod A spiral contractile spring 31 is connectedat one end to the outer end of -the piston and i opposite end to a crossbar in the piston rod 1G. The longitudinal slots 33 are formed in thehollow piston rod near the. outer end thereof, and extending from thepiston 14 in a sleeve 34 which encircles the hollow piston rod 16 so asto close the slots therein. A pin 35 is .secured in the .piston rod 30and the opposite ends 4thereof7 extend through the slots 33 and are lsecured in the opposite sides of the sleeve 34 to limit the slidingmovement of the piston 1e with relation to the piston rod 16, It

4will be seen that upon the exhaust stroke of the piston 2, the burnedgases which enter the cylinder 5 will be forced into the hollowpistonrod 1 6 against the inner face of the piston 14, and will tend tomove the piston 14 away from the outer end ot the hollow piston rod 16against the action of the spring 31. It will be seen that upon. theoutward movement of the piston 14, the sleeve 34; vwill be movedoutwardly on the piston rodl 16 and uncover the slots 33 through whichthe gaseswill flow and escape through the exhaust ports 29. When thepiston 2 has '-impleted its upward stroke and the gases nave beenexhausted from the cylinder) 11,

' the action. of the spring 31will tend to draw the piston 14 againstthe upper edge of the hollow piston rod 16, and the sleeve 34 will closethe openings 33 in the rod 16 and the pump is then ready for anotheroperation;

In View of the above description, taken in connection with theaccompanying drawing, it willA be seen that we have provided an air pumpwhich is adapted for use with the cylinder fof. an explosive engine andwhich requires ay minimum number'of parts, which may be cheaplyconstructed and which will fuliil v'all the requirements of such adevice.

WhileV--the'construction illustrated in the in the details ofconstruction without departing from the spirit of the-invention orsacrlcmg any of its advantages, as determined by the scope of theappended claims.

Having thus fully described our invention, what we claim and desire tosecure by Letters Patent is: Y f

1. A pump comprising a cylinder, inlet and outlet ports formed in saidcylinder, spaced pistons mounted for .reciprocation in said cylinder',one of said pistons having an opening therein, a hollow piston rodmountedl within said opening at one end and extending to the other ofsaid pistons, said hollow piston rod being formed with longitudinalslots near its free end, a sleeve connected" to said other piston and'adapted to encircle the free end of said hollow piston iod and extendlover the slots therein, and flexible means connecting said other pistonwith said hollow piston rod to normally maintain said sleeve over saidslots, as and for the purpose described.

2. A pump comprising a cylinder, inlet and outlet ports formed in saidcylinder, spaced pistons mounted for reciprocation in said cylinder, oneot' said pistons having an opening therein, a hollow piston rod mountedwithin said opening at one end extending to the other of said pistons,said hollow piston rod beingformed with longitudinal slots near itsfreeend, a sleeve connected to said other piston and adapted to encirclethe free end of said hollow piston rod and extend over the slotstherein, a pin mounted. in

the walls of said sleeve and projectingV throughsaid slots to limit theseparation of said pistons, and a spring connected to said other pistonand to the hollow piston rod to normally maintain said sleeve over theslots in said hollow pist-on rod, as and for the purpose described.4

3. A pump comprising a cylinder, inlet and outlet ports4 formed in saidcylinder, spaced pistons mounted for reciprocaticn in said cylinder, oneof saidpistons having an opening therein, a hollov.7 piston rod mountedin said opening at one end and extending to the other of said pistons, asolid piston rod connected to said other piston and extending withinsaid hollov,T piston rod, and

a spring connected to said piston rods for holding said other-'piston inengagement i ediwiqthin said-,SEM .one end, nd .exf .:itendm to' thegoter ofjfsaid ton ro.` connected .withsaid ot er'piston and -sleeveconnected nwith said other piston and .idapted to encircletheofree endof said holow' 104:,

vagainst the free end of the hollow piston rod,

os and'for. the pur ose described.

In testimony w ereof we hereunto affix 'our signatures in the presenceof two wit- 15 nesses.

disposed within thefre'e end -ofsaid hollow pisbon'rod, the free end ofthe hollow iston.

IOdibBlg'fOlmed longitudinal S OS, 8. FRITZ K. HOIENSTIEN CHARLES G.MEYERS.

l' Witnesses:

RALPH H. HUssnN, Jnms Buur.

piston rodfand extend over the slots therein and njieans forconnectinsad. pistonrods to normally hold sald ot er p1ston Uoplol ofthis potent my 'be obtained for nu uente nach, by addressing theCommissioner of Intenta,

l Wuhhlltol, n.0."

